Note. The theme archive contains the wallpaper. You do not need to download it independently.

You can also put the theme to /usr/share/fluxbox/styles.

If you choose to use /usr/share/fluxbox/styles then you must point the location of the wallpaper manually by using feh or nitrogen (or something else). Alternatively, you could change the wallpaper path of the theme. To do this look for a line: background.pixmap . The line is to be found within the theme.cfg file of the theme.

Further notes: In the case of Fluxbox it is recommended to install feh.